This was a tough one for sure.
But I will try to help anyone who needs it.
This important thing to understand is that
for in this sentence is used to open a prepositional phrase. Even if you remove prepositional phrases the sentence will stand.
On to the options:
The epicure has long maintained that
her passion for good food, fine wine, and all of life’s other sensual pleasures are the keys to her attainment of true happiness.
A. her passion
for good food, fine wine, and all of life’s other sensual pleasures are the keys to her attainment of true happiness.
B. her passion
for good food, fine wine, and all of life’s other sensual pleasures is the keys to her attainment of true happiness.
C. her passion
for good food, for fine wine, and for all of life’s other sensual pleasures were the keys to her attainment of true happiness.
Now you can see that options A, B, and C have an SVA error. Options D and E eliminate this error by making the complex subject -
good food, fine wine, and all of life's other sensual pleasures the subject.
Between option D and E
D. good food, fine wine, and all of life’s other sensual pleasures – each a passion of hers – are the keys to her attainment of true happiness.
Rule: Whatever is between the dashes is removable. So this sentence is correct.The epicure has long maintained that good food, fine wine, and all of life’s other sensual pleasures
– each a passion of hers – are the keys to her attainment of true happiness.
E. good food, fine wine, and all of life’s other sensual pleasures, all of them were her passions and were -
We need simple present tense for ongoing events/ habits/ universal truths.